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Effects of non‐carious cervical lesion size, occlusal loading and restoration on biomechanical behaviour of premolar teeth
Author(s) -
Zeola LF,
Pereira FA,
Machado AC,
Reis BR,
Kaidonis J,
Xie Z,
Townsend GC,
Ranjitkar S,
Soares PV
Publication year - 2016
Publication title -
australian dental journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.701
H-Index - 71
eISSN - 1834-7819
pISSN - 0045-0421
DOI - 10.1111/adj.12391
Subject(s) - premolar , dentistry , biomechanics , strain gauge , fracture (geology) , orthodontics , materials science , von mises yield criterion , tooth fracture , lesion , medicine , finite element method , composite material , molar , structural engineering , surgery , anatomy , engineering
Background Information on fracture biomechanics has implications in materials research and clinical practice. The aim of this study was to analyse the influence of non‐carious cervical lesion ( NCCL ) size, restorative status and direction of occlusal loading on the biomechanical behaviour of mandibular premolars, using finite element analysis ( FEA ), strain gauge tests and fracture resistance tests. Methods Ten buccal cusps were loaded on the outer and inner slopes to calculate the strain generated cervically. Data were collected for healthy teeth at baseline and progressively at three lesion depths (0.5 mm, 1.0 mm and 1.5 mm), followed by restoration with resin composite. The magnitude and distribution of von Mises stress and maximum principal stress were simulated at all stages using FEA , and fracture strength was also determined (n = 7 per group). Results There were significant effects of the lesion size and loading directions on stress, strain and fracture resistance (p < 0.05). Fracture resistance values decreased with increase in lesion size, but returned to baseline with restorations. Conclusions Combined assessment of computer‐based and experimental techniques provide an holistic approach to characterize the biomechanical behaviour of teeth with both unrestored and restored NCCL s.